<!DOCTYPE html>
<style>
#container div {
  height: 50px;
  border: 1px solid black;
  margin-top: 2px;
}
#container {
  margin-top: 110px;
}
</style>
<div id="container">
<!-- The geometries below matches the imperfect subpixel painting after
     the composited layers are moved in subpixels. -->
  <div></div>
  <div style="height: 51px"></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div style="height: 51px"></div>
</div>
